{

#region Constants and Fields

/// <summary>

/// The sync root.

/// </summary>

private static readonly object SyncRoot = new object();

/// <summary>

/// The categories.

/// </summary>

private static Dictionary<Guid, List<Category>> categories = new Dictionary<Guid, List<Category>>();

/// <summary>

/// The description.

/// </summary>

private string description;

/// <summary>

/// The parent.

/// </summary>

private Guid? parent;

/// <summary>

/// The title.

/// </summary>

private string title;

#endregion

#region Constructors and Destructors

/// <summary>

/// Initializes static members of the <see cref="Category"/> class.

/// </summary>

static Category()

{

Blog.Saved += (s, e) =>

{

if (e.Action == SaveAction.Delete)

{

Blog blog = s as Blog;

if (blog != null)

{

// remove deleted blog from static 'categories'

if (categories != null && categories.ContainsKey(blog.Id))

categories.Remove(blog.Id);

}

}

};

}

/// <summary>

/// Initializes a new instance of the <see cref = "Category" /> class.

/// </summary>

public Category()

{

this.Id = Guid.NewGuid();

}

/// <summary>

/// Initializes a new instance of the <see cref="Category"/> class.

/// The category.

/// </summary>

/// <param name="title">

/// The title.

/// </param>

/// <param name="description">

/// The description.

/// </param>

public Category(string title, string description)

{

this.Id = Guid.NewGuid();

this.title = title;

this.description = description;

this.Parent = null;

}

#endregion

#region Properties

/// <summary>

/// Gets a sorted list of all Categories.

/// </summary>

/// <value>The categories.</value>

public static List<Category> Categories

{

get

{

Blog blog = Blog.CurrentInstance;

List<Category> blogCategories;

if (!categories.TryGetValue(blog.BlogId, out blogCategories))

{

lock (SyncRoot)

{

if (!categories.TryGetValue(blog.BlogId, out blogCategories))

{

categories[blog.Id] = blogCategories = BlogService.FillCategories(blog);

if(blogCategories != null)

blogCategories.Sort();

}

}

}

return blogCategories;

}

}

/// <summary>

/// Gets a sorted list of all Categories across all blog instances.

/// </summary>

/// <value>The categories.</value>

public static List<Category> AllBlogCategories

{

get

{

List<Blog> blogs = Blog.Blogs.Where(b => b.IsActive).ToList();

Guid originalBlogInstanceIdOverride = Blog.InstanceIdOverride;

List<Category> categoriesAcrossAllBlogs = new List<Category>();

// Categories are not loaded for a blog instance until that blog

// instance is first accessed. For blog instances where the

// categories have not yet been loaded, using InstanceIdOverride to

// temporarily switch the blog CurrentInstance blog so the Categories

// for that blog instance can be loaded.

//

for (int i = 0; i < blogs.Count; i++)

{

List<Category> blogCategories;

if (!categories.TryGetValue(blogs[i].Id, out blogCategories))

{

// temporarily override the Current BlogId to the

// blog Id we need categories to be loaded for.

Blog.InstanceIdOverride = blogs[i].Id;

blogCategories = Categories;

Blog.InstanceIdOverride = originalBlogInstanceIdOverride;

}

categoriesAcrossAllBlogs.AddRange(blogCategories);

}

return categoriesAcrossAllBlogs;

}

}

/// <summary>

/// Gets a sorted list of all Categories, taking into account the

/// current blog instance's Site Aggregation status in determining if

/// categories from just the current instance or all instances should

/// be returned.

/// </summary>

/// <remarks>

/// This logic could be put into the normal 'Categories' property, however

/// there are times when a Site Aggregation blog instance may just need

/// its own categories. So ApplicableCategories can be called when data

/// across all blog instances may be needed, and Categories can be called

/// when data for just the current blog instance is needed.

/// </remarks>

public static List<Category> ApplicableCategories

{

get

{

if (Blog.CurrentInstance.IsSiteAggregation)

return AllBlogCategories;

else

return Categories;

}

}

/// <summary>

/// Gets the absolute link to the page displaying all posts for this category.

/// </summary>

/// <value>The absolute link.</value>

public Uri AbsoluteLink

{

get

{

return new Uri(this.Blog.AbsoluteWebRootAuthority + this.RelativeLink);

}

}

/// <summary>

/// Returns a relative link if possible if the hostname of this blog instance matches the

/// hostname of the site aggregation blog. If the hostname is different, then the

/// absolute link is returned.

/// </summary>

public string RelativeOrAbsoluteLink

{

get

{

if (this.Blog.DoesHostnameDifferFromSiteAggregationBlog)

return this.AbsoluteLink.ToString();

else

return this.RelativeLink;

}

}

/// <summary>

/// Gets or sets the Description of the object.

/// </summary>

/// <value>The description.</value>

public string Description

{

get

{

return this.description;

}

set

{

base.SetValue("Description", value, ref this.description);

}

}

/// <summary>

/// Gets the absolute link to the feed for this category's posts.

/// </summary>

/// <value>The feed absolute link.</value>

public Uri FeedAbsoluteLink

{

get

{

return Utils.ConvertToAbsolute(this.FeedRelativeLink);

}

}

/// <summary>

/// Gets the relative link to the feed for this category's posts.

/// </summary>

/// <value>The feed relative link.</value>

public string FeedRelativeLink

{

get

{

var root = Blog.CurrentInstance.IsSiteAggregation ? Utils.ApplicationRelativeWebRoot : Blog.RelativeWebRoot;

return string.Format("{0}category/feed/{1}{2}", root,

Utils.RemoveIllegalCharacters(this.Title),

BlogConfig.FileExtension);

}

}

/// <summary>

/// Gets or sets the Parent ID of the object

/// </summary>

/// <value>The parent.</value>

public Guid? Parent

{

get

{

return this.parent;

}

set

{

base.SetValue("Parent", value, ref this.parent);

}

}

/// <summary>

/// Gets all posts in this category.

/// </summary>

/// <value>The posts.</value>

public List<Post> Posts

{

get

{

return Post.GetPostsByCategory(this.Id);

}

}

/// <summary>

/// Gets the relative link to the page displaying all posts for this category.

/// </summary>

/// <value>The relative link.</value>

public string RelativeLink

{

get

{

var root = Blog.CurrentInstance.IsSiteAggregation ? Utils.ApplicationRelativeWebRoot : Blog.RelativeWebRoot;

return root + "category/" + Utils.RemoveIllegalCharacters(this.Title) +

BlogConfig.FileExtension;

}

}

/// <summary>

/// Gets or sets the Title or the object.

/// </summary>

/// <value>The title.</value>

public string Title

{

get

{

return this.title;

}

set

{

base.SetValue("Title", value, ref this.title);

}

}

#endregion

#region Public Methods

/// <summary>

/// Returns a category based on the specified id.

/// </summary>

/// <param name="id">

/// The category id.

/// </param>

/// <returns>

/// The category.

/// </returns>

public static Category GetCategory(Guid id)

{

return GetCategory(id, false);

}

/// <summary>

/// Returns a category based on the specified id.

/// </summary>

/// <param name="id">

/// The category id.

/// </param>

/// <param name="acrossAllBlogInstances">

/// Whether to search across the categories of all blog instances.

/// </param>

/// <returns>

/// The category.

/// </returns>

public static Category GetCategory(Guid id, bool acrossAllBlogInstances)

{

return (acrossAllBlogInstances ? AllBlogCategories : Categories).FirstOrDefault(category => category.Id == id);

}

/// <summary>

/// Gets the full title with Parent names included

/// </summary>

/// <returns>

/// The complete title.

/// </returns>

public string CompleteTitle()

{

if (parent == null)

return title;

var cat = GetCategory((Guid)parent, Blog.CurrentInstance.IsSiteAggregation);

return cat == null ? title : $"{cat.CompleteTitle()} - {title}";

}

/// <summary>

/// Returns a <see cref="T:System.String"></see> that represents the current <see cref="T:System.Object"></see>.

/// </summary>

/// <returns>

/// A <see cref="T:System.String"></see> that represents the current <see cref="T:System.Object"></see>.

/// </returns>

public override string ToString()

{

return this.CompleteTitle();

}

#endregion

#region Implemented Interfaces

#region IComparable<Category>

/// <summary>

/// Compares the current object with another object of the same type.

/// </summary>

/// <param name="other">

/// An object to compare with this object.

/// </param>

/// <returns>

/// A 32-bit signed integer that indicates the relative order of the objects being compared.

/// The return value has the following meanings: Value Meaning Less than zero This object is

/// less than the other parameter.Zero This object is equal to other. Greater than zero This object is greater than other.

/// </returns>

public int CompareTo(Category other)

{

return this.CompleteTitle().CompareTo(other.CompleteTitle());

}

#endregion

#endregion

#region Methods

/// <summary>

/// Deletes the object from the data store.

/// </summary>

protected override void DataDelete()

{

if (this.Deleted)

{

foreach (var c in

Categories.ToArray().Where(

c => !c.Id.Equals(this.Id) && c.Parent.HasValue && c.Parent.Value.Equals(this.Id)))

{

c.Parent = null;

c.Save();

}

BlogService.DeleteCategory(this);

}

if (Categories.Contains(this))

{

Categories.Remove(this);

}

this.Dispose();

}

/// <summary>

/// Inserts a new object to the data store.

/// </summary>

protected override void DataInsert()

{

if (this.New)

{

BlogService.InsertCategory(this);

}

}

/// <summary>

/// Retrieves the object from the data store and populates it.

/// </summary>

/// <param name="id">

/// The unique identifier of the object.

/// </param>

/// <returns>

/// True if the object exists and is being populated successfully

/// </returns>

protected override Category DataSelect(Guid id)

{

return BlogService.SelectCategory(id);

}

/// <summary>

/// Updates the object in its data store.

/// </summary>

protected override void DataUpdate()

{

if (this.IsChanged)

{

BlogService.UpdateCategory(this);

}

}

/// <summary>

/// Reinforces the business rules by adding additional rules to the

/// broken rules collection.

/// </summary>

protected override void ValidationRules()

{

this.AddRule("Title", "Title must be set", string.IsNullOrEmpty(this.Title));

}

#endregion